Eight-speed transmissions with four planetary gear sets

Active Publication Date: 2006-07-27
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It is an object of the present invention to provide an improved eight speed transmission having four planetary gear sets controlled to provide eight forward speed ratios and at least one reverse speed ratio. Preferably, three reverse speed ratios are achieved. The various embodiments of t

Problems solved by technology

This severely limited the overall speed range of the vehicle and therefore required a relatively large engine that could produce a wide speed and torque range.
This resulted in the engine operating at a specific fuel consumption point during cruising, other than the most efficient point.
While many trucks employ power transmissions having six or more forward speed rati

Method used

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  • Eight-speed transmissions with four planetary gear sets
  • Eight-speed transmissions with four planetary gear sets
  • Eight-speed transmissions with four planetary gear sets

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Embodiment Construction

[0038] Referring to the drawings, wherein like reference numerals represent the same or corresponding parts through the several views, there is shown in FIG. 1A a powertrain 10 having a conventional engine and torque converter 12, a planetary transmission 14 and a conventional final drive mechanism 16.

[0039] The planetary transmission 14 includes an input shaft 17 continuously connected with the engine and torque converter 12, a planetary gear arrangement 18, and an output shaft 19 continuously connected with the final drive mechanism 16. The planetary gear arrangement 18 includes four planetary gear sets 20, 30, 40 and 50.

[0040] The planetary gear set 20 includes a sun gear member 22, a ring gear member 24, and a planet carrier assembly member 26. The planet carrier assembly member 26 includes a plurality of pinion gears 27 rotatably mounted on a carrier member 29 and disposed in meshing relationship with both the sun gear member 22 and the ring gear member 24.

[0041] The planeta...

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Abstract

Eight-speed transmissions are provided that include four planetary gear sets having seven torque-transmitting mechanisms and various fixed interconnections to provide eight forward speed ratios and at least one reverse speed ratio. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another of the planetary gear members. The seven torque-transmitting mechanisms are operated in combinations of two. Reduced component speeds and improved ratios are achieved.

Description

TECHNICAL FIELD [0001] The present invention relates to power transmissions having four planetary gear sets that are controlled by seven torque-transmitting devices to provide eight forward speed ratios and at least one reverse speed ratio. BACKGROUND OF THE INVENTION [0002] Passenger vehicles include a powertrain that is comprised of an engine, multi-speed transmission, and a differential or final drive. The multi-speed transmission increases the overall operating range of the vehicle by permitting the engine to operate through its torque range a number of times. The number of forward speed ratios that are available in the transmission determines the number of times the engine torque range is repeated. Early automatic transmissions had two speed ranges. This severely limited the overall speed range of the vehicle and therefore required a relatively large engine that could produce a wide speed and torque range. This resulted in the engine operating at a specific fuel consumption poi...

Claims

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Application Information

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IPC IPC(8): F16H3/44
CPCF16H3/66F16H3/666F16H2200/006F16H2200/0091F16H2200/2012F16H2200/2048
Inventor KLEMEN, DONALD
Owner GM GLOBAL TECH OPERATIONS LLC
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